One of the biggest overlooked aspects of the ultimate garage gym is free floor space!
If your garage gym is so cluttered that you can't just walk in and wod, you might as well use your squat rack to hang up your clean laundry.
I see many garage gyms with squat cages... and I LOVE squats and cages for safety and versatility, but make sure you have the free space for this. If you're tight for space, LOOK UP!
A ceiling mounted pullup bar, combined with a portable squat rack gives you 90% of the utility of a squat cage, and uses 10% of the usable floor space.